Question

Calculate the electrical energy consumed in using a bulb of 200W
for 6hrs and also find the cost of energy RS 5 per unit​

Answer 1

${\pmb{\sf{{Given \; that}}}} \\ \tt  Bulb  \: of  \: 200 \:  watts  \: used \:  for  \: 6 \:  hours\\ \\  {\pmb{\sf{\underline{To \; find}}}} \\  \:  \tt \: electrical  \: energy \:  consumed \\ \tt cost \:  of energy \:  at \:  Rs \:  5  \: per \:  unit \\  \\ {\pmb{\sf{\underline{Solution}}}} \\  \tt The \:  electrical  \: energy  \: consumed = 1.2 \:  kWh \\   \tt \: The \:  cost \:  of \:  energy  \: at  \: Rupees  \: 5  \: per  \: unit = 6  \: Rupees \\  \\ {\pmb{\sf{{Using \; concepts}}}} \\   \sf \: Formula \:  to \:  find  \: out \:  the  \:  energy  =  {\small{{\boxed{\sf{Energy \: =   \:  Power \times Time}}}}} ​​ \\ \sf \: Formula  \: to  \: find  \: out \:  the \:  cost  \: of  \: energy \:  at  \: Rupees \:  5  \: per \:  unit ={\small{{\boxed{\sf{Energy \: consumed \: \times Given \: amount}}}}}​​ \\ \\  \\  {\pmb{\sf{\underline{Full \; Solution}}}} \\  \\  {\small{{\boxed{\sf{Energy \: = Power \times Time}}}}}​​ \\ {\sf{ Energy \: = Power \times Time}} \\ {\sf{ Energy \: = 200 \times 6}} \\ {\sf{ Energy \: = 1200 \: watts}} \\ {\underline{\frak{Hence, \: 1200 \: watts \: is \: electric \: energy \: consumed}}}​ \\  \\  \\ {\small{{\boxed{\sf{1 \: W \: = 0.001 \: kW}}}}} \\ {\sf{ 1 \: W \: = 0.001 \: kW}} \\ {\sf{ 200 \: W \: = 0.001(200)}} \\ {\sf{ 0.2 \: kWh}} \\​ \\  \\ {\small{{\boxed{\sf{Energy \: = Power \times Time}}}}}​​ \\ {\sf{ Energy \: = Power \times Time}} \\ {\sf{ Energy \: = 0.2 \times 6}} \\ {\sf{ Energy \: = 1.2 kWh}} \\  \\  \\ {\small{{\boxed{\sf{Energy \: consumed \: \times Given \: amount}}}}}​​ \\ {\sf{ Energy \: consumed \: \times Given \: amount}} \\  {\sf{ 1.2 \times 5}} \\ {\sf{ Rupees \: 6}}$